from django.db import models
from	django.db.models.query	import	QuerySet
# Create your models here.
from django.utils import timezone 
from django.contrib.auth.models import User 
 # 类名PublishedManager为自拟名称，该类继承自models.Manager
from django.urls import reverse
from taggit.managers import TaggableManager
class PublishedManager(models.Manager):
# 重写Manager父类的get_queryset方法，'-> QuerySet'是新语法表示方法的返回值是QuerySet类型
  def get_queryset(self) -> QuerySet:
 # 通过super()调用父类get_queryset()方法获取所有文章再调用过滤方法filter，获得已经发布的文章
    return super(PublishedManager, self).get_queryset().filter(status='published')

class Post(models.Model): 
# 重新创建初始模型管理器，确保初始模型管理器可用 
  objects = models.Manager()  
  published = PublishedManager()
  tags = TaggableManager() 
  STATUS_CHOICES = ( 
    ('draft', 'Draft'), 
    ('published', 'Published') 
  ) 
  title = models.CharField(max_length=250) 
  body = models.TextField() 
  slug = models.SlugField(max_length=250, unique_for_date='publish') 
  author = models.ForeignKey(User, on_delete=models.CASCADE, related_name='author') 
  publish = models.DateTimeField(default=timezone.now) 
  created = models.DateTimeField(auto_now_add=True) 
  updated = models.DateTimeField(auto_now=True) 
  status = models.CharField(max_length=10, choices=STATUS_CHOICES, 
  default='draft') 
  class Meta: 
    ordering = ('-publish',) 
  def __str__(self): 
    return self.title 
  def get_absolute_url(self):
    return reverse('blog:post_detail', args=[self.publish.year,
 self.publish.month, self.publish.day, self.slug])

class Comment(models.Model):
  post = models.ForeignKey(Post,
  on_delete=models.CASCADE,
  related_name='comments')
  name = models.CharField(max_length=80)
  email = models.EmailField()
  body = models.TextField()
  created = models.DateTimeField(auto_now_add=True)
  updated = models.DateTimeField(auto_now=True)
  active = models.BooleanField(default=True)
  class Meta:
    ordering = ('created',)
  def __str__(self):
    return f'Comment by {self.name} on {self.post}'
